Assassins Creed Rogue mountain climbing glitch

I encountered this particular glitch when I was trying to reach an Animus fragment that appeared to be at the peak of this particular mountain (on one of the larger islands in the Atlantic). Turns out the animus fragment was in a cave far below me and the mini-map gave a misleading position so I spent a long time trying to climb this mountain. I did eventually get to the top by pure luck, and then this happened: